Reversible hydrogenation studies of NaBH4 milled with Ni-containing additives
NaBH4 has long been identified as a viable hydrogen-storage material due to a theoretical gravimetric H2 capacity of 10.6 wt %. Because of the high enthalpy of decomposition of 108 ± 3 kJ mol -1, thermal decomposition of the pristine material does not occur until at least 500 C, and thus NaBH4 has y...
| Main Authors: | , , , , |
|---|---|
| Format: | Journal Article |
| Published: |
2013
|
| Online Access: | http://hdl.handle.net/20.500.11937/25450 |
| _version_ | 1848751712565723136 |
|---|---|
| author | Humphries, Terry Kalantzopoulos, G. Llamas-Jansa, I. Olsen, J. Hauback, B. |
| author_facet | Humphries, Terry Kalantzopoulos, G. Llamas-Jansa, I. Olsen, J. Hauback, B. |
| author_sort | Humphries, Terry |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | NaBH4 has long been identified as a viable hydrogen-storage material due to a theoretical gravimetric H2 capacity of 10.6 wt %. Because of the high enthalpy of decomposition of 108 ± 3 kJ mol -1, thermal decomposition of the pristine material does not occur until at least 500 C, and thus NaBH4 has yet to be utilized in hydrogen-storage processes. In this study, NaBH4 has been milled with a variety of Ni-containing additives to investigate the effects on the temperatures required for thermal desorption of H2 by temperature-programmed desorption (TPD) measurements and the products characterized by powder X-ray diffraction (PXD). Ni-containing additives have been determined to significantly enhance the thermal desorption of H2 by at least 60 C (Ni (65 wt %) on Si/Al2O3). PCT cycling experiments have been conducted to ascertain their effects on the reversible hydrogenation of the milled NaBH4. PXD analysis indicates that Ni reacts with B evolved during thermal decomposition to form NixB y species including Ni3B, Ni2B, and Ni 3B4. A catalyst screening study of NaBH4 with a variety of nanoparticles, chlorides, borides, and mesoporous materials has also been conducted, the most effective of which has been found to be Pd nanoparticles, which have a desorption temperature of 420 C, a decrease of at least 85 C. © 2013 American Chemical Society. |
| first_indexed | 2025-11-14T07:57:05Z |
| format | Journal Article |
| id | curtin-20.500.11937-25450 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:57:05Z |
| publishDate | 2013 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-254502018-03-29T09:09:14Z Reversible hydrogenation studies of NaBH4 milled with Ni-containing additives Humphries, Terry Kalantzopoulos, G. Llamas-Jansa, I. Olsen, J. Hauback, B. NaBH4 has long been identified as a viable hydrogen-storage material due to a theoretical gravimetric H2 capacity of 10.6 wt %. Because of the high enthalpy of decomposition of 108 ± 3 kJ mol -1, thermal decomposition of the pristine material does not occur until at least 500 C, and thus NaBH4 has yet to be utilized in hydrogen-storage processes. In this study, NaBH4 has been milled with a variety of Ni-containing additives to investigate the effects on the temperatures required for thermal desorption of H2 by temperature-programmed desorption (TPD) measurements and the products characterized by powder X-ray diffraction (PXD). Ni-containing additives have been determined to significantly enhance the thermal desorption of H2 by at least 60 C (Ni (65 wt %) on Si/Al2O3). PCT cycling experiments have been conducted to ascertain their effects on the reversible hydrogenation of the milled NaBH4. PXD analysis indicates that Ni reacts with B evolved during thermal decomposition to form NixB y species including Ni3B, Ni2B, and Ni 3B4. A catalyst screening study of NaBH4 with a variety of nanoparticles, chlorides, borides, and mesoporous materials has also been conducted, the most effective of which has been found to be Pd nanoparticles, which have a desorption temperature of 420 C, a decrease of at least 85 C. © 2013 American Chemical Society. 2013 Journal Article http://hdl.handle.net/20.500.11937/25450 10.1021/jp312105w restricted |
| spellingShingle | Humphries, Terry Kalantzopoulos, G. Llamas-Jansa, I. Olsen, J. Hauback, B. Reversible hydrogenation studies of NaBH4 milled with Ni-containing additives |
| title | Reversible hydrogenation studies of NaBH4 milled with Ni-containing additives |
| title_full | Reversible hydrogenation studies of NaBH4 milled with Ni-containing additives |
| title_fullStr | Reversible hydrogenation studies of NaBH4 milled with Ni-containing additives |
| title_full_unstemmed | Reversible hydrogenation studies of NaBH4 milled with Ni-containing additives |
| title_short | Reversible hydrogenation studies of NaBH4 milled with Ni-containing additives |
| title_sort | reversible hydrogenation studies of nabh4 milled with ni-containing additives |
| url | http://hdl.handle.net/20.500.11937/25450 |